It seems I always have an issue after riding in heavy rain. I rode to work and back in yesterday's soaking rain. This morning I noticed the power dropping out between 4,600 & 5,000 RPM. I first noticed it under hard acceleration in second gear. After passing 4,600 RPM, the power dropped out and the bike stumbled until the revs rose past 5,000 RPM. It also did it in third and fourth gears under gentle acceleration.

Above 5,000 & below 4,600 RPM, everything is good. The problem is trouble in that narrow RPM range. Any ideas?